STUDIES ON THE FORMATION OF PEN .2. POLYMERIZATION OF BIS(HYDROXYETHYL)NAPHTHALATE BY VARIOUS METALLIC CATALYSTS

Bis (hydroxyethyl) naphthalate (BHEN) was polymerized to polyethylenen aphthalate (PEN) in the presence of various metallic catalysts. The in fluence of the nature and concentration of these catalysts on the rate of polymerization has been investigated. The order of decreasing cata lytic influence of various metal ions on the polymerization of BHEN wa s found to be: Ti > Sb > Zn > Co > Pb > Ni (Mg). The effect of the rea ction temperature has also been studied. The optimal concentration of these catalyst and reaction temperature were found to be 30 X 10(-5) ( mol/mol BHEN) and 285-293-degrees-C, respectively. Because of its inso lubility in ordinary solvent, the molecular weight of PEN was measured using the light scattering method. (C) 1994 John Wiley & Sons, Inc.